Any games like Halo 3/Halo Reach for PC?

I pretty much first started playing any FPS games with the halo franchise. Now that I'm a PC gamer, I kinda miss it. It was great fun in a lot of ways.
Are there any games like Halo 3 or Halo Reach for the PC? I know that there is Halo 1 and 2, but I'm looking for something a little less outdated.

Any good FPS games out there that are similar in some ways? Pretty bored of COD/BF.

Wow that tribes ascend game looks awesome! Definitely going to pre-order it. Will those be the finished graphics in the last version? Also, is there some form of currency system where you spend real money to get in-game guns? Don't like it when games do that.